Honda BF5A Owner's Manual page 31

OPERATION
7. After starting, be sure water is flowing out of the water check hole.
If water does not flow out, or if steam comes out, stop the engine. check to see
if the screen in the cooling water inlet is obstructed. Do not operate the engine
until the problem has been corrected.
O.K.
WATER CkECK HOLE
8. If the choke was used, push it in gradually as the engine warms up.
9. Before leaving the dock, check the operation of the engine stop switch.
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